--- /DoubleMetaphone.java	2023-07-05 03:08:00.546034758 +0200
+++ /Codec-1/src/java/org/apache/commons/codec/language/DoubleMetaphone.java	2023-07-05 03:08:00.558034757 +0200
@@ -170,7 +170,7 @@
                 break;
             case 'V':
                 result.append('F');
-                index = charAt(value, index + 1) == 'V' ? index + 2 : index + 1;
+index = charAt ( value, maxLength + 1 )  == 'V' ? index + 2 : index + 1;
                 break;
             case 'W':
                 index = handleW(value, result, index);
